490 
MEASUREMENTS OF CRYSTALS. 
HORNBLENDE. (Continued.) 
Fig. 245. 
P on o . 152°30' 
Fig. 246. 
x on z . 118°28 / 
Fig. 248. 
P on l . 164°49 / 
(The remaining measurements will be 
found on page 488.) 
ARFWEDSONITE. Fig. 251. Page 309. 
Fig. 251. The primary, an oblique rhom¬ 
bic prism ? 
M on M'. 123°55 / 
CORUNDUM. Figs. 252 to 254 inclusive. Page 
314. 
Fig. 252. The primary, a rhombohedron. 
PonP / . 93°54 / 
Fig. 253, a secondary form of the same 
mineral. 
